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Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2012
Debt Instrument [Line Items] |  |  |  |  |
Prepayment penalty on long-term debt | $ 0 | $ 5,554 | $ 532 |  |
Gains (Losses) on Restructuring of Debt |  | 5,600 | 500 | $ 3,200 |
Amortization of prepayment penalty on long-term debt | 5,719 | 6,176 | 6,047 |  |
Prepayment Penalty, Future Amortization Expense [Abstract] |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 100,000 |  |  |  |
Money Pledged as Collateral for FHLB Advance Borrowings | 25,000 | 25,000 |  |  |
FHLB Debt Prepaid |  | $ 50,000 | $ 54,500 |  |
FHLB Debt Prepaid Weighted Avg Rate |  | 3150.00% | 1.59% |  |
FHLB Debt Amount Restructured |  |  |  | $ 50,000 |
Broker Repurchase Agreements |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt repurchased during period |  |  |  |  | $ 300,000
Debt repurchased during period, rate |  |  |  |  | 1.75%
Prepayment penalty on long-term debt | $ 25,000 |  |  |  |
Effective interest rate percentage | 3.55% |  |  |  |
Prepayment Penalty, Future Amortization Expense [Abstract] |  |  |  |  |
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Two | $ 0 |  |  |  |
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt repurchased during period, rate |  |  |  | 1.25% |
Effective interest rate percentage | 3.52% |  |  |  |
Prepayment Penalty, Future Amortization Expense [Abstract] |  |  |  |  |
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Two | $ 0 |  |  |  |

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- Definition Debt Instrument, Repurchase Amount, Redemption Premium Percentage + References No definition available. + Details
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- Definition FHLB Debt Amount Restructured + References No definition available. + Details
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- Definition FHLB Debt Prepaid + References No definition available. + Details
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- Definition Long-term Debt, Debt Extinguishment Costs, Future Amortization Expense [Abstract] + References No definition available. + Details
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- Definition Long-term Debt, Prepayment Penalty + References No definition available. + Details
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- Definition Money Pledged as Collateral for FHLB Advance Borrowings + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition For a debtor, the aggregate gain (loss) recognized on the restructuring of payables arises from the difference between the book value of the debt before the restructuring and the fair value of the payments on the debt after restructuring is complete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 60 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6402221&loc=d3e15743-112638 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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